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Which of the following represents the co...

Which of the following represents the correct electron distribution in magnesium ion ?

A

2, 8

B

2, 8, 1

C

2, 8, 2

D

2, 8, 3

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The correct Answer is:
A
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
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  2. The subatomic particle called electron was discovered by :

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  3. Which of the following represents the correct electron distribution in...

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  4. The correct electronic configuration of a chloride ion is :

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  5. Goldstein's experiments which involved passing high voltage electricit...

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  6. The number of electrons in the atom of an element X is 15 and the numb...

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  7. The ion of an element has 3 positive charges. The mass number of atom ...

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  8. The first model of an atom was given by

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  9. Which of the following statement is always correct?

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  10. From the symbol .(15)^(31)P, state : (i) mass number of phosphorus,...

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  11. The atom of an element X has 7 electrons in its M shell (a) Write th...

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  12. An atom of element E contains 3 protons, 3 electrons and 4 neutrons : ...

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  13. An atom of an element X may be written as .(4)^(9)X What does the fi...

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  14. The electronic configuration of an element Z is 2, 8, 8. (a) What is...

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  15. The total number of electrons in a nitrogen atom is 7. Find the number...

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  16. What is the general name of the elements having 8 electrons in the val...

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  17. Which noble gas has less than 8 electrons in the valence shell of its ...

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  18. State on use of radioactive isotopes in medicine.

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  19. Give one example of a radioactive isotope which is used as a fuel in t...

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  20. Name the ratioactive isotopes which is used in the treatment of cancer...

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